A
board to board connector assembly (100) includes a plug connector (10) and a receptacle connector (20) for receiving the plug connector along a
mating direction. The plug connector includes a plug insulative housing (11) and a number of plug contacts (12) received in the plug insulative housing. The receptacle connector includes a receptacle insulative housing (21) and a number of receptacle contacts (23) received in the receptacle insulative housing. Each of the plug contact and the receptacle contact includes a main portion (121, 121′, 231, 231′), a
soldering pad (120, 120′, 230, 230′), a retention beam (122, 122′, 232, 232′), and a contacting beam (123, 123′, 233, 233′). The contacting beam of the plug contact has an inclined face (124, 124′) and a securing portion (125, 125′) protruding toward the retention beam. The contacting beam of the receptacle contact has a
tail portion (235, 235′) angularly extending towards the retention beam. The plug contact inclined face initially guidingly engages with the receptacle contact
tail portion and finally the receptacle contact
tail portion is positioned between the securing portion and the main portion of the plug contact when the plug and receptacle connectors are mated to each other.